The combination of photolysis and gas-liquid -chromatography results in "fingerprints" which-are much superior 'to the pyrolysis gas chromatography method for the identification or organic compounds.With this photolysis-GLC· method. a number -of methyl ethers, benzyl ethers. isopropyl ethers and tert-butylethers were chromatographically purified and photolytically decomposed by way of mercury sensitization.The photolytic degration products were temperature programmed in a sensitive gas-liq~id chromatograph.The "fingerprint" product peaks were calculated into retention indices • .J I-values and I-values, and grouped into homologous peaks. common peaks and distinctive peaks.Identification of parent structures is obtained by the correlatton of retention indices in the above three groups of peaks.
The extraction of itaconic acid from aqueous solution by the ion exchange method has been studied.
With the anion exchange resin Amberlite IR‐45(OH) both ammonium hydroxide and sodium hydroxide can be used as effective elutriants and can concentrate the itaconic acid solution to three fold in a single run.
Sodium hydroxide is comparatively a better elutriant than ammonium hydroxide.
More concentrated elutriants (about 4N NH4OH and 3N NaOH) give sharper peaks and narrower ranges under the peaks of the elution curves and complete the elution to 96–99% at an earlier stage than the dilute ones.
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